Is More Flow Better, Is The Smallest Intake Port That Flows The Most The Best
If you are going to port heads velocity management is imperative.
Just standing at a flow bench and getting more flow and running the velocity up can get you in trouble.
A running engine isn’t static, and adding fuel to air changes everything.
Ive seen way more heads with a bunch of velocity lose power because once you add fuel you change everything.
Yup.
The only reason fuel vaporizes without heating it in a carb is the pressure drop which results from the increase in velocity. Local pressure drops under vapor pressure and poof, gas vapors.
Vapors turn corners better, but sharp corners have stagnation points which can push the local pressure over the vapor pressure and then fuel condenses out.
Boundary layers are also slower, and the gradient is related to the Reynolds number, which is a complex subject but suffice to say slow flow will have a slower velocity gradient next to a wall which makes it even more difficult to keep fuel evaporated. A liquid in the flow will also introduce turbulence and can totally bone the flow. Not always, but it makes it more likely.
It's also not just that vaporized fuel is a good thing, it's that a good port will tend to keep fuel in vapor form. The conditions that make it precipitate out also steal energy from the flow and will reduce flow potential as a result. Vaporized fuel is easier to burn, but the pressure loss and recovery across a valve will almost always condense fuel out in certain conditions - typically at higher manifold pressures. The chamber and valve job should have more effect on this than the port though.
Another consideration is that smaller/faster ports can limit the available "supercharging effect" of overlap, since the pressure wave is going to significantly increase velocity. If the port is already choked, the effect will be diminished. This is why it's foolish for people to choose parts based on matching flow numbers (not to mention flow is tested at depressions that don't adequately match an operating engine!).
Part choice and design need to match intended goals.